Plastic jar



FIG. 1 is a perspective view of a plastic jar showing my new design;

FIG. 2 is a front side view thereof, shown at an enlarged scale;

FIG. 3 is a rear side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a perspective view of FIG. 1 shown with an unclaimed handle, shown at the same scale as FIG. 1.

The broken lines shown in the drawings are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a plastic jar, as shown and described. 